Advertisements
Advertisements
प्रश्न
Two stable isotopes of lithium `""_3^6"Li"` and `""_3^7"Li"` have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium.
Advertisements
उत्तर
Mass of lithium isotope `""_3^6 "Li"`, m1 = 6.01512 u
Mass of lithium isotope `""_3^7 "Li"`, m2 = 7.01600 u
Abundance of `""_3^6 "Li"`, η1 = 7.5%
Abundance of `""_3^7 "Li"`, η2 = 92.5%
The atomic mass of lithium atom is given as:
`"m" = ("m"_1η_1 + "m"_2η_2)/(η_1 + η_2)`
= `(6.01512 xx 7.5 + 7.01600 xx 92.5)/(92.5 + 7.5)`
= 6.940934 u
संबंधित प्रश्न
Boron has two stable isotopes, `""_5^10"B"` and `""_5^11"B"`. Their respective masses are 10.01294 u and 11.00931 u, and the atomic mass of boron is 10.811 u. Find the abundances of `""_5^10"B"` and `""_5^11"B"`.
The three stable isotopes of neon: `""_10^20"Ne"`, `""_10^21"Ne"` and `""_10^22"Ne"` have respective abundances of 90.51%, 0.27% and 9.22%. The atomic masses of the three isotopes are 19.99 u, 20.99 u and 21.99 u, respectively. Obtain the average atomic mass of neon.
Name a material which is used in making control rods in a nuclear reactor.
Write one balanced equation to show Emission of `beta^-` (i.e. a negative beta particle)
With the help of a suitable example and an equation, explain the term pair production.
Show that the density of nucleus over a wide range of nuclei is constant-independent of mass number A.
If neutrons exert only attractive force, why don't we have a nucleus containing neutrons alone?
Nuclear species or nuclides are shown by the notation ________ where X is the chemical symbol of the species.
The nuclei of isotopes of a given element contain the same number of ______.
A vessel contains oil (density 0.8 g/cm3) over mercury (density 13.6 g/cm3). A sphere of homogeneous composition floats with half its volume immersed in mercury and the other half in oil. The density of the material of the sphere in g/cm3 is ______.
Are the nucleons fundamental particles, or do they consist of still smaller parts? One way to find out is to probe a nucleon just as Rutherford probed an atom. What should be the kinetic energy of an electron for it to be able to probe a nucleon? Assume the diameter of a nucleon to be approximately 10–15 m.
A nuclide 1 is said to be the mirror isobar of nuclide 2 if Z1 = N2 and Z2 = N1. (a) What nuclide is a mirror isobar of 1123 Na? (b) Which nuclide out of the two mirror isobars have greater binding energy and why?
Before the neutrino hypothesis, the beta decay process was throught to be the transition, `n -> p + vece`. If this was true, show that if the neutron was at rest, the proton and electron would emerge with fixed energies and calculate them. Experimentally, the electron energy was found to have a large range.
Two nuclei have different mass numbers A1 and A2. Are these nuclei necessarily the isotopes of the same element? Explain.
Two nuclei may have the same radius, even though they contain different numbers of protons and neutrons. Explain.
Assertion (R): Fusion of hydrogen nuclei into helium nuclei is the source of energy of all stars.
Reason (R): In fusion heavier nuclei split to form lighter nuclei.
The volume occupied by an atom is greater than the volume of the nucleus by a factor of about:
